Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland

PA Gares, RGD DavidsonArnott, BO Bauer, DJ Sherman, RWG Carter, DWT Jackson, KF Nordstrom

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Past studies of coastal aeolian sediment transport have adopted a two-dimensional perspective relying on data collected from single survey transects normal to the shoreline to represent wind speed and sediment flux. Although this approach provides a useful approximation to the aeolian system, it presumes that air flow is steady and uniform and that single-point data or transect samples represent broader beach conditions. These conditions are frequently not satisfied because beaches are three-dimensional systems with substantial alongshore variation. This study focuses on spatial variations in sediment transport and in surface sediment characteristics that affect transport during offshore winds. The sediment flux was sampled over 15 minute intervals with vertical traps positioned to monitor small-scale (0-5 m), and medium-scale (0-50 m) alongshore variations. Variability in trapped sediment flux is of the order of +/- 30% of the mean flux at both spatial scales. Alongshore variations for sediment size (+/- 10% of the mean) and carbonate content (+/- 7% of the mean) are too small to explain entirely the variability in sediment flux. Variations in moisture content (+/- 35% of the mean) are large enough to account for flux variability, especially when coupled with the potentially important role of wind gustiness. The combined effect of wind gustiness and moisture variations produces non-uniform sediment transport, manifested as streamers of sand that move across the beach. The irregular streamer movement results in selective interception by traps producing variable sediment trapping rates.
LanguageEnglish
Pages673-682
JournalJournal of Coastal Research
Volume12
Issue number3
Publication statusPublished - 1996

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sediment transport
sediment
beach
transect
interception
airflow
trapping
shoreline
moisture content
spatial variation
wind velocity
moisture
carbonate
sand

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Gares, PA., DavidsonArnott, RGD., Bauer, BO., Sherman, DJ., Carter, RWG., Jackson, DWT., & Nordstrom, KF. (1996). Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland. Journal of Coastal Research, 12(3), 673-682.
Gares, PA ; DavidsonArnott, RGD ; Bauer, BO ; Sherman, DJ ; Carter, RWG ; Jackson, DWT ; Nordstrom, KF. / Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland. In: Journal of Coastal Research. 1996 ; Vol. 12, No. 3. pp. 673-682.
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abstract = "Past studies of coastal aeolian sediment transport have adopted a two-dimensional perspective relying on data collected from single survey transects normal to the shoreline to represent wind speed and sediment flux. Although this approach provides a useful approximation to the aeolian system, it presumes that air flow is steady and uniform and that single-point data or transect samples represent broader beach conditions. These conditions are frequently not satisfied because beaches are three-dimensional systems with substantial alongshore variation. This study focuses on spatial variations in sediment transport and in surface sediment characteristics that affect transport during offshore winds. The sediment flux was sampled over 15 minute intervals with vertical traps positioned to monitor small-scale (0-5 m), and medium-scale (0-50 m) alongshore variations. Variability in trapped sediment flux is of the order of +/- 30{\%} of the mean flux at both spatial scales. Alongshore variations for sediment size (+/- 10{\%} of the mean) and carbonate content (+/- 7{\%} of the mean) are too small to explain entirely the variability in sediment flux. Variations in moisture content (+/- 35{\%} of the mean) are large enough to account for flux variability, especially when coupled with the potentially important role of wind gustiness. The combined effect of wind gustiness and moisture variations produces non-uniform sediment transport, manifested as streamers of sand that move across the beach. The irregular streamer movement results in selective interception by traps producing variable sediment trapping rates.",
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Gares, PA, DavidsonArnott, RGD, Bauer, BO, Sherman, DJ, Carter, RWG, Jackson, DWT & Nordstrom, KF 1996, 'Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland', Journal of Coastal Research, vol. 12, no. 3, pp. 673-682.

Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland. / Gares, PA; DavidsonArnott, RGD; Bauer, BO; Sherman, DJ; Carter, RWG; Jackson, DWT; Nordstrom, KF.

In: Journal of Coastal Research, Vol. 12, No. 3, 1996, p. 673-682.

Research output: Contribution to journalArticle

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AU - Nordstrom, KF

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N2 - Past studies of coastal aeolian sediment transport have adopted a two-dimensional perspective relying on data collected from single survey transects normal to the shoreline to represent wind speed and sediment flux. Although this approach provides a useful approximation to the aeolian system, it presumes that air flow is steady and uniform and that single-point data or transect samples represent broader beach conditions. These conditions are frequently not satisfied because beaches are three-dimensional systems with substantial alongshore variation. This study focuses on spatial variations in sediment transport and in surface sediment characteristics that affect transport during offshore winds. The sediment flux was sampled over 15 minute intervals with vertical traps positioned to monitor small-scale (0-5 m), and medium-scale (0-50 m) alongshore variations. Variability in trapped sediment flux is of the order of +/- 30% of the mean flux at both spatial scales. Alongshore variations for sediment size (+/- 10% of the mean) and carbonate content (+/- 7% of the mean) are too small to explain entirely the variability in sediment flux. Variations in moisture content (+/- 35% of the mean) are large enough to account for flux variability, especially when coupled with the potentially important role of wind gustiness. The combined effect of wind gustiness and moisture variations produces non-uniform sediment transport, manifested as streamers of sand that move across the beach. The irregular streamer movement results in selective interception by traps producing variable sediment trapping rates.

AB - Past studies of coastal aeolian sediment transport have adopted a two-dimensional perspective relying on data collected from single survey transects normal to the shoreline to represent wind speed and sediment flux. Although this approach provides a useful approximation to the aeolian system, it presumes that air flow is steady and uniform and that single-point data or transect samples represent broader beach conditions. These conditions are frequently not satisfied because beaches are three-dimensional systems with substantial alongshore variation. This study focuses on spatial variations in sediment transport and in surface sediment characteristics that affect transport during offshore winds. The sediment flux was sampled over 15 minute intervals with vertical traps positioned to monitor small-scale (0-5 m), and medium-scale (0-50 m) alongshore variations. Variability in trapped sediment flux is of the order of +/- 30% of the mean flux at both spatial scales. Alongshore variations for sediment size (+/- 10% of the mean) and carbonate content (+/- 7% of the mean) are too small to explain entirely the variability in sediment flux. Variations in moisture content (+/- 35% of the mean) are large enough to account for flux variability, especially when coupled with the potentially important role of wind gustiness. The combined effect of wind gustiness and moisture variations produces non-uniform sediment transport, manifested as streamers of sand that move across the beach. The irregular streamer movement results in selective interception by traps producing variable sediment trapping rates.

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Gares PA, DavidsonArnott RGD, Bauer BO, Sherman DJ, Carter RWG, Jackson DWT et al. Alongshore variations in aeolian sediment transport: Carrick Finn Strand, Ireland. Journal of Coastal Research. 1996;12(3):673-682.